Make sure also that your text "Offset Setting" is set at 0. [Often this setting is obscured on the extreme right hand side of the toolbar.]

Place your cursor as close to "12
o'clock" as you can.

Type your text.

Click apply and carefully shift to horizontal
centre if it is a bit out of plumb using the grid lines as a guide :) The text may slightly rotate as you move it.

Now return to the first inner circle [Circle
one] on the layer below and making sure that the circle layer itself is
selected use your pen tool to edit the path to go in an anticlockwise
direction. Right click and "Reverse Path"

Select text tool and with cursor in "6
o'clock" position type text using the same settings. Zoom in and carefully
centre as before. [The text will slide into position nicely]

Now turn off the visibility of both inner
circles:

New Vector Layer and print time and date in
the Centre:

You can make sure it is centred perfectly by
Objects>align> centre in canvas.

This is how it will appear on a printed page
at 300ppi:

Save your image as a .pspimage and then you
can edit size and any of the text and materials as you wish. I suggest that you use an installed font if you do so.

I
usually prefer a grungy look when using in an image – achieved by using
materials with texture.

I also like using a cancellation stamp as a
label :) – it is very adaptable J